package lotterysystem.lotterysystem.service.activitystatus.impl;

import jakarta.annotation.Resource;
import lotterysystem.lotterysystem.common.errorcode.ServiceErrorCodeConstants;
import lotterysystem.lotterysystem.common.exception.ServiceException;
import lotterysystem.lotterysystem.service.ActivityService;
import lotterysystem.lotterysystem.service.activitystatus.ActivityStatusManager;
import lotterysystem.lotterysystem.service.activitystatus.operator.AbstractActivityOperator;
import lotterysystem.lotterysystem.service.dto.ConvertActivityStatusDTO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

@Component
public class ActivityStatusManagerImpl implements ActivityStatusManager {

    private static final Logger logger = LoggerFactory.getLogger(ActivityStatusManagerImpl.class);

    @Resource
    private final Map<String, AbstractActivityOperator> operatorMap = new HashMap<>();

    @Resource
    private ActivityService activityService;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void handlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {
        // 1.活动状态扭转有依赖性，导致代码维护性差
        // 2.扭转条件可能会有拓展
        if (CollectionUtils.isEmpty(operatorMap)) {

            logger.warn("operatorMap 为空！");
            return;

        }
        Map<String, AbstractActivityOperator> currentMap = new HashMap<>(operatorMap);
        Boolean update = false;

        // 先处理：人员，奖品状态
        update = processConvertStatus(convertActivityStatusDTO,currentMap,1);
        // 后处理：活动

        update =processConvertStatus(convertActivityStatusDTO,currentMap,2) || update;

        // 更新缓存
        if (update) {
            activityService.cacheActivity(convertActivityStatusDTO.getActivityId());
        }

    }

    @Override
    public void rollbackHandlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {
        // operatorMap：活动，奖品，人员
        // 活动是否需要回滚？？？需要
        // 奖品处于INIT状态，活动下的奖品没抽完
        for (AbstractActivityOperator operator : operatorMap.values()) {
            operator.convert(convertActivityStatusDTO);
        }
        // 缓存更新
        activityService.cacheActivity(convertActivityStatusDTO.getActivityId());
    }

    private Boolean processConvertStatus(ConvertActivityStatusDTO convertActivityStatusDTO,
                                         Map<String, AbstractActivityOperator> currentMap,
                                         int sequence) {

        Boolean update = false;
        // 遍历currentMap
        Iterator<Map.Entry<String,AbstractActivityOperator>> iterator = currentMap.entrySet().iterator();
        while (iterator.hasNext()) {
            AbstractActivityOperator operator = iterator.next().getValue();
            // Operator 是否需要转换
            if (operator.sequence() != sequence
                    || !operator.needConvert((convertActivityStatusDTO))) {
                continue;
            }
            // 需要：转换
            if (!operator.convert(convertActivityStatusDTO)) {
                logger.error("{}状态转换失败！",operator.getClass().getName());
                throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_STATUS_CONVERT_ERROR);
            }
            // currentMap 删除当前Operator
            iterator.remove();
            update = true;
        }
        // 返回
        return update;

    }
}
